Related Clues:

• Fastball, in baseball slang
• It's a driving concern
• Jeff Gordon goes nowhere without it
• "Juice" for Jeff Gordon
• Car's need
• Ozone, e.g
• Source of bloating
• Cooking choice
• Car "go" liquid
• Road trip necessity
• Krypton, e.g
• Beano competitor
• Nitrogen or helium
• Fill-up filler
• Today's theme, initially — source of amusement